Technical description and composition of the TOSHIBA 22AV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 22AV703R
Chassis / Version: MST3740EU-T MAIN BD 22AV704R
Panel: V216B1-L02 75016438
Inverter (backlight): 0400RHL9 REV01 75018788
Power Supply (PSU): 0400RHL9 REV01 75018788
MainBoard: MST1922EU-T REV1.03 75018787
IC MainBoard: MST9A884JL, TPA6132A2RTER TAS5707L MP2359DJ
Tuner: TT212X
Technical Specifications 22AV703
TOSHIBA 22AV703R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 22AV703R, 22AV704R TV is better to start with a thorough external inspection and troubleshooting. It is advisable to carefully examine the internal and external components. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Sometimes the TOSHIBA 22AV703R, 22AV704R TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most probable cause of the malfunction is the failure of the general power supply module 0400RHL9 REV01 75018788. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, if it fails, the cause should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
If the TOSHIBA 22AV703R, 22AV704R does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
In most cases, the diagnosis and repair of the 0400RHL9 REV01 75018788 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or breaks in high-voltage circuits and when the lamps are depressurized. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Repair of the motherboard MST1922EU-T REV1.03 75018787 must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. The board is repaired and the TPA6132A2RTER TAS5707L MP2359DJ MST9A884JL microchips are replaced with the necessary equipment and the corresponding components.
Before replacing the TT212X tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
It should be remembered! Attempts to repair the TOSHIBA 22AV703R, 22AV704R TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete failure of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV703R (22AV703R)
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 22AV703R
1. Service Manual 51 pages on models 19AV703R, 22AV703R, 26AV703R, 32AV703R, 32LV703R, 37LV703R, 40LV703R, 19AV704R, 22AV704R, 26AV704R, 32AV704R, 32LV704R, 37LV704R, 40LV704R
2. Service Manuals with Schematic Diagrams 73 pages on models 19AV703, 22AV703, 26AV703, 32AV703, 19AV703R, 22AV703R, 26AV703R, 32AV703R, 19AV703G, 22AV703G, 26AV703G, 32AV703G
The appearance of the MainBoard MST1922EU-T is shown in the figure below:MST1922EU-T
MST1922EU-T can be used in TVs:
TOSHIBA 19AV703R (Panel M185B1-L03 Rev C2 75016448 (5v)), TOSHIBA 19AV704R (Panel M185B1-L03 RevC2), TOSHIBA 22AV703R (Panel V216B1-L02 75016438).
Key Features of the TOSHIBA 22AV703R:
Installed matrix (LCD panel) V216B1-L02 75016438.
The inverter 0400RHL9 is used to power the backlight.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 22AV703R TV is carried out by the 0400RHL9 power module, or its analogs.
MainBoard - the main board (motherboard) is an MST1922EU-T module, using MST9A884JL, TPA6132A2RTER TAS5707L MP2359DJ microcircuits, and others.
The TT212X tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V216B1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN
Active Area: 477.417x268.416 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 800
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TOSHIBA 22AV703 LCD TV with V216B1-L02 LCD, 22 "(55 cm) diagonal display in 16: 9 format. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 1000: 1. Dynamic contrast ratio of 10000: 1 is achieved by special control of the backlight. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in an analog system . PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i Supported multimedia file formats:. MP3, JPEG.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, SCART, RGB, VGA, HDMI x2, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV in the operating mode from the network is 55 watts.
Overall dimensions: 555x400x195 mm.
TV Weight: 6.5 kg.
Attention! The TOSHIBA 22AV703 LCD TV panel V216B1-L02 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!